agp/intel: Experiment with a 855GM GWB bit

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=27187
Tested-by: Thorsten Vollmer <thorsten@thvo.de> (DFI-ACP G5M150-N w/852GME)
Tested-by: Moritz Brunner <2points@gmx.org> (Asus M2400N/i855GM)
Tested-by: Indan Zupancic <indan@nul.nu> (Thinkpad X40/855GM rev 02)
Tested-by: Eric Anholt <eric@anholt.net> (865G)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/char/agp/intel-agp.h b/drivers/char/agp/intel-agp.h
index c195bfe..5feebe2 100644 (file)
--- a/drivers/char/agp/intel-agp.h
+++ b/drivers/char/agp/intel-agp.h
@@ -130,6 +130,7 @@
 #define INTEL_GMCH_GMS_STOLEN_352M     (0xd << 4)
 
 #define I915_IFPADDR    0x60
+#define I830_HIC        0x70
 
 /* Intel 965G registers */
 #define I965_MSAC 0x62

diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index fab3d32..0d09b53 100644 (file)
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -21,6 +21,7 @@
 #include <linux/kernel.h>
 #include <linux/pagemap.h>
 #include <linux/agp_backend.h>
+#include <linux/delay.h>
 #include <asm/smp.h>
 #include "agp.h"
 #include "intel-agp.h"
@@ -70,12 +71,8 @@ static struct _intel_private {
        u32 __iomem *gtt;               /* I915G */
        bool clear_fake_agp; /* on first access via agp, fill with scratch */
        int num_dcache_entries;
-       union {
-               void __iomem *i9xx_flush_page;
-               void *i8xx_flush_page;
-       };
+       void __iomem *i9xx_flush_page;
        char *i81x_gtt_table;
-       struct page *i8xx_page;
        struct resource ifp_resource;
        int resource_valid;
        struct page *scratch_page;
@@ -722,28 +719,6 @@ static int intel_fake_agp_fetch_size(void)
 
 static void i830_cleanup(void)
 {
-       if (intel_private.i8xx_flush_page) {
-               kunmap(intel_private.i8xx_flush_page);
-               intel_private.i8xx_flush_page = NULL;
-       }
-
-       __free_page(intel_private.i8xx_page);
-       intel_private.i8xx_page = NULL;
-}
-
-static void intel_i830_setup_flush(void)
-{
-       /* return if we've already set the flush mechanism up */
-       if (intel_private.i8xx_page)
-               return;
-
-       intel_private.i8xx_page = alloc_page(GFP_KERNEL);
-       if (!intel_private.i8xx_page)
-               return;
-
-       intel_private.i8xx_flush_page = kmap(intel_private.i8xx_page);
-       if (!intel_private.i8xx_flush_page)
-               i830_cleanup();
 }
 
 /* The chipset_flush interface needs to get data that has already been
@@ -758,14 +733,27 @@ static void intel_i830_setup_flush(void)
  */
 static void i830_chipset_flush(void)
 {
-       unsigned int *pg = intel_private.i8xx_flush_page;
+       unsigned long timeout = jiffies + msecs_to_jiffies(1000);
+
+       /* Forcibly evict everything from the CPU write buffers.
+        * clflush appears to be insufficient.
+        */
+       wbinvd_on_all_cpus();
+
+       /* Now we've only seen documents for this magic bit on 855GM,
+        * we hope it exists for the other gen2 chipsets...
+        *
+        * Also works as advertised on my 845G.
+        */
+       writel(readl(intel_private.registers+I830_HIC) | (1<<31),
+              intel_private.registers+I830_HIC);
 
-       memset(pg, 0, 1024);
+       while (readl(intel_private.registers+I830_HIC) & (1<<31)) {
+               if (time_after(jiffies, timeout))
+                       break;
 
-       if (cpu_has_clflush)
-               clflush_cache_range(pg, 1024);
-       else if (wbinvd_on_all_cpus() != 0)
-               printk(KERN_ERR "Timed out waiting for cache flush.\n");
+               udelay(50);
+       }
 }
 
 static void i830_write_entry(dma_addr_t addr, unsigned int entry,
@@ -849,8 +837,6 @@ static int i830_setup(void)
 
        intel_private.gtt_bus_addr = reg_addr + I810_PTE_BASE;
 
-       intel_i830_setup_flush();
-
        return 0;
 }